The design purpose of Chinese garden is to symbolize myriad natural phenomena through various scenes inside gardens. Garden design can be further divided into five aspects i.e. general layout, artificial mountain, pond, architecture and flower/tree. This essay focuses on artificial mountain design, and deals with the following issue: did traditional philosophic aspect constitute an important influence on artificial mountain designs in Chinese gardens? This study proposes to explore the following three major factors, namely, traditional philosophic aspect, design theory of artificial mountain, and traditional culture/garden inter-relationships, by way of hermeneutical approach, and further substantiates them with extant examples of artificial mountains in Chinese gardens. The conclusion of this essay is that the traditional philosophic aspect based on Yin-yang theory had a positive influence upon artificial mountain designs in Chinese gardens. There are also five subsidiary conclusions: 1) By way of summarizing and distilling the characteristics of real mountains, Chinese garden designers aptly applied the design prinicples of artificial mountain in Chinese gardens so as to achieve the purpose of letting spirit wander through the universe while body still remaining inside a confined space of limited area. 2) Through contrasting and yet unified design principles composed of themes such as artificial/real, limited area/mountain and forest, precinct/idea, space/time, the traditional philosophic aspect was able to have a positive influence upon the artificial mountain designs in Chinese gardens. 3) By providing strollers with the choices of both static and dynamic viewings on artificial mountains in Chinese gardens, the garden designers hoped to simulate the strolling experience of real mountains and waters, and eventually led viewers into a state of mind wherein Nature and Man are One. 4) It is necessary for garden strollers to have a better understanding of traditional culture in order to appreciate the spirit and meanings contained in Chinese garden designs. 5) Garden (artificial mountain) design principles in China were based upon Taoist thought.